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W. B. SANDFORD.

RRRRRRRRRRRRRRRRRRRRRR P SQUARE PIPE.

No. 410,202. Patented Se 13.3, 1889. ./4- fyi 7716526555: ,hz/'e/zfw? N PETERS. whulnumegmpnw. wam: nnnnnn UNITED STATES PATENT OEE1CE.

VILLIAM B. SANDFORD, OF KElVAN EE, ILLINOIS, ASSIGN OR TO THE I-IAXTUN STEAM HEATER COMPANY, OF SAME PLAGE.

ROLLS FOR THE MANUFACTU RE OF SQUARE PIPE,

SPECIFICATION forming part of Letters Patent N o. 410,202, dated September 3, 1889.

Application filed .T une 7, 1888.

To @ZZ whom, it may concern:

Be it known. that I, WILLIAM B. SANDEORD, of Kewanee,in the county of Henry and State of Illinois, and a citizen of the United States, have invented a new and useful Improvement in Rolls for the Manufacture of Square Metal Pipe, of which the following is a specification, reference being had to the accompanying drawings, in which- 1 Figure l is a vertical section through a portion .of tworolls, taken at their contact-points,

showing the form of the grooves in the peripheries of the two rolls. Fig. 2 is a view the same as that shown in Fig. l, except that the form of the groove is different. In Figs. l and 2 the faces and sides of each groove are concave. Fig. 3 is a section like that shown in Fig. l, the grooves in the faces of the rolls being angular. Fig. 4f represents a cross-seetion through a straightening-die, and this figure is on a smaller scale than the other figures. Fig. 5 represents two pairs of rolls mounted in a single frame.

Letters Patent of the United States No. 368,622 were granted to me August 23, 1887, for improvement in the manufacture of square metal pipe, in which patent I showed and described devices for manufacturing square metal pipe from round pipe without the use of a mandrel or other interior support, the leading feature -in such patent being bellshaped dies substantially rectangular in crosssection on the inside and having their acting faces more or less concaved. According to said patent, square pipe could be-made by drawing round pipe through such dies. I also used, to make t-he most perfect form, finishing-rolls each having an annular groove. I also used a straightening-die to prevent twistmg- The object of my present invention is to provide improved devices for manufacturing square metal pipe from round pipe without the use of a mandrel or other interior support.

The new feature of my present invention consists in rolls each provided with a groove in its face, the sides of each groove being concave instead of straight, as illustrated in the drawings, and hereinafter fully described.

That which I claim as new will be pointed out in the claim.

serai No. 276,310. N0 model.)

In the drawings, A represents a roll made of metal, as is usual.

B is a groove in the periphery or face of the roll A. The two sides a a are each somewhat concaved, as shown inthe drawings. C is another roll similar to the roll A. It is provided with a groove D in its periphery or face, and the sides b of this grooveV are coneaved the same as the sides a a. ofthe roll A. These rolls A C are to be of any suitable size, and are to bemounted in a strong frame, and may be drivenby cog-wheels in the usual manner. E F are two other rolls similar to rolls A C, except that the sides of the grooves in these two rolls E F are concaved less than are the sides of the grooves in the rolls A C. These rolls E F are also to be mounted in a strong frame and may be driven in any suitable manner.

A convenient way to arrange the rolls is to place the two A C upon 011e side and E F upon the opposite side of the same frame, as shown in Fig.

It will be seen that in each of the grooved rolls A C and E F the concaved portions a and b of the grooves are located between straight portions that constitute the four corners of the pass between the respective pairs of rolls.

In manufacturing square pipe from round pipe by the use of these rolls the pipe is to be first suitably heated in a furnace, and each piece is then to be passed first between the rolls A C, the movement of the rolls forcing `the pipe through them. After a piece of pipe has been passed through the rolls A O it is to be passed through the rolls E F, the grooves in the faces of which are less concave than those in the rolls A C, and when the pipe leaves the rolls E F it will be nearly, if not quite, square. However, to bring the pipe to its most perfect form, I use finishing-rolls G I-I, which are provided with grooves in their faces, the sides of which grooves are straight, the grooves being so formed that when the two rolls are together the two grooves form an exact square. These finishing-rolls are the same as those shown in my former patent. I also use in connection with each pair of rolls a straighteningdie similar to that which is shown in Fig. 4, which is substantially the same as is shown in my former patent, the

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pipe passing through such a die after it leaves each pair of rolls. The object of these dies is not to give the pipe its square form, but to prevent it from twisting. I also use in connection with each pair of rolls a trough, into which the pipe is delivered after it passes through the straightening-die.

In Fig. 5, a represents a piece of pipe, and b a trough in which the pipe is delivered. The finishing-rolls G II may be mounted in a separate frame and driven in the usual manner. The concave form of the faces of the grooves in these rolls A C and E F is very important, and without this form square pipe could not be made from round pipe by the use of the rolls, because if the faces of the grooves were straight the metal in the pipe would buckle inward while passing between the rolls, and it would then be iinpracticable to bring the interior of the pipe to a substantially square form.

I am able to manufacture square pipe from round pipe without the use of a mandrel or other interior support by means of rolls having grooves, the faces of which are concave, much more rapidly than by the use of the dies described in my former patent. The pipe can be forced between the rolls by their movement, and can be passed between two or three sets of rolls without being reheated, While, when the dies are used, the pipe should be reheated after having been Vdrawn through one die before being drawn through another.

In Figs. l, 2, and 3 the rolls are full size for the manufacture of pipe two inches square. In Fig. 5 I have not shown straightening-dies but they may be supported in any suitable manner, and should be located so as to receive the pipe as it passes from the rolls, substantially as shown in my former patent.

What I claim as new, and desire to secure by Letters Patent, is as follows:

A pair of rolls each having in its face a groove that is concaved between the straight portions that constitute the four corners of the pass between said rolls, substantially as and for the purpose specified.

WILLIAM B; SANDFORD.

Vitnesses:

W. E. HAXTUN, A. M. HEWLETT. 

